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Click on map to open large map in new window (Map updated: 11 August 2009)

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.The map is generated through the NBN Gateway using their Interactive Mapping Tool.

This is one of the first lichens the beginner will notice on walls of limestone rock. The thallus forms flat, smooth, light grey patches, strongly zoned towards the edge. It can dominate rock surfaces, often turning considerable areas white. On close inspection, the surface will be seen to be minutely cracked into areoles (little ‘island’ pieces of thallus) in which the small, angular discs are immersed.